The main thing you can learn at this point (for this kind of scenes) is how lighting works. This is a very common way to draw where you just paint things with the color that item has without giving too much importance on the light sources. Changing this around will improve things for you significantly. Example, if you can make a black and white (and shades of grey) image work correctly (proper shading), it's not that hard to then add color information to it.
Here is a very very quick edit of your image to demonstrate. You have one strong light source, which is the fireplace. By understanding how light works (falloff of brightness with distance, angle between light direction and surface normal, geometry of shadow casting) you can paint a more accurate image that has more depth/proper feeling of space.
If you look at just the shading information, you can see more clearly how this point light source affects the scene:
Anyway, everyone starts here and any tutorials on light you will read will help you improve. Here are my suggestions:
http://finalbossblues.com/pixel-tutorials/http://www.drububu.com/tutorial/index.htmlhttp://www.wayuki.net/tut-light.phphttp://androidarts.com/art_tut.htmAnd I really love this piece to understand lighting setups:
http://www.itchy-animation.co.uk/light.htmRead, learn, do practice images (like your current one, but apply everything you've learned in the current session). Rinse, repeat. Read a page or two a day and do an image. When you're over all these tutorials you'll be in much better place. And post your images here in the mean time. In my opinion you don't really need individual feedback and direction on all steps of the way when you're this much at the beginning. The more you read (and try to apply) the more you will be able to notice and correct things on your own. But sharing your learning path is great and you can see how much you've improved over time.
